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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - Estimate of Fair Value Measurement - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | $ 148,204 | $ 137,239
Total liabilities at fair value on a recurring basis | 115,879 | 121,319
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 102,422 | 94,772
Notes receivable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 45,782 | 42,467
Revolving credit facility and term loans |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total liabilities at fair value on a recurring basis | 115,879 | 121,319
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 102,422 | 94,772
Total liabilities at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 102,422 | 94,772
Quoted Prices in Active Markets for Identical Assets (Level 1) | Notes receivable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Revolving credit facility and term loans |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total liabilities at fair value on a recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 0 | 0
Total liabilities at fair value on a recurring basis | 115,879 | 121,319
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) | Notes receivable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) | Revolving credit facility and term loans |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total liabilities at fair value on a recurring basis | 115,879 | 121,319
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 45,782 | 42,467
Total liabilities at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) | Notes receivable |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total assets at fair value on a recurring basis | 45,782 | 42,467
Significant Unobservable Inputs (Level 3) | Revolving credit facility and term loans |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total liabilities at fair value on a recurring basis | $ 0 | $ 0

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